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| Titel |
Capturing spatio-temporal variability in wind driven sediment transport on the beach |
| VerfasserIn |
Ate Poortinga, Saskia M. Visser, Michel Riksen, Andreas Baas |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051278
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| Zusammenfassung |
| Aeolian sediment transport from the beach to the dunes is the driving process of coastal dune
evolution. Simulation of this process enables scenario analysis in order to evaluate the
impact of e.g. climatic change on dune evolution. However, important factors in the
process of sediment transport over the beach are characterized by a large spatial
and temporal variability. These factors comprise soil moisture, wind energy and
aeolian streamers. The non-linearity of the process makes modeling of aeolian
sediment transport and dune evolution even more complex. Modeling attempts
are hampered by lack of data as datasets often have a small temporal and spatial
resolution.
This study developed a strategy to measure aeolian sediment budgets, directions and
patterns for modeling purposes. Sediment fluxes were measured by introducing three new
designs of the Modified Wilson and Cook sediment catchers. Thirty-seven catchers were
installed over an area of 1.5 ha at the north-western beach of the Dutch island Ameland. A
weather station was installed to collect meteorological data. As soil moisture is a main
constraint in sediment transport, soil moisture as well as landscape evolution were monitored
every five minutes by a camera placed on top of the dune. To study the change in wind energy
with variable geomorphology, two sonic anemometers were placed on different locations
along a transect. Groundwater levels were checked everyday along a transect of
piezometers from beach to dune. The preliminary results of this field campaign
will be presented. This paper discusses the measurement setup, reliability of the
measured data and suitability of this data for model input, calibration and validation. |
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